Would this explode a tempered bottom? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 11-03-2011, 03:09 PM Thread Starter
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Question Would this explode a tempered bottom?

Has anyone tried to heat an aquarium via a sheet heater adhered to the outside of the glass? (Mcmaster-carr part number 35765K287)

Obviously that's only a heater and I'd need a separate heat controller / temperature probe.

So it's a 12" X 18" silicone sheet putting out 2.5 watts per square inch (for a total of 540w) . . . the question is, would a tempered bottom explode if you heated it up?

Oh, and I'm interested in doing this because:
#1 It makes for a less cluttered tank
#2 It will heat the gravel / plants' roots
#3 This provides more "even heat" without strong circulation
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post #2 of 6 (permalink) Old 11-03-2011, 04:45 PM
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The glass will explode but not unless the temp exceeds 300F+. I once accidentally left a glass lid on top of a stove ;eek;


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post #3 of 6 (permalink) Old 11-03-2011, 04:58 PM
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I busted the bottom of a turtle tank with a heat tape because that part of the turtle tank got dry. Some water leaked onto it and the temp change caused it to go BOOM.

However, I do not think that a constant heat on a damp surface would cause harm. It wouldn't be efficient, due to a large portion of the heat escaping OUT and away from the glass, and you'd be heating through glass and substrate, which would be much less efficient than heating water directly.

If your only goal is to remove the heater from the tank, and inline heater like hydor or lifeguard modules is what I would recommend.
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post #4 of 6 (permalink) Old 11-04-2011, 04:26 PM
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Heating the plants roots was very in vogue years ago, but most people find it more trouble than it is worth, and it is not worth much...
Any circulation you have will move heat around enough. You don't need high flow with an in-line heater.

But all that stated, yes, it would work fine. Use some insulation below the mat-- either polystyrene or the mylar reflector plus foam wrap-- would help more heat get where you want it.


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post #5 of 6 (permalink) Old 11-04-2011, 06:44 PM
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I'm still angry over the "cold root syndrome" crap that so much hulllaballoo was made about, back in the late 90's/early 2000's. I read every article and website I could find about it and nearly took the plunge with a DIY version, but never did.

Glad I didn't.



Now the final answer to this question regarding the tempered glass---- tempered glass is usually quite tough against heat. However it is NOT good with thermal expansion.


If this thing gets really warm, I suppose it could case the tempered to want to expand, and the silicone joints around (or on top of) it could give it pressure. I had a fireplace glass door explode once (in the summer, no fire at all, just a normal day) because the glass was tempered but siliconed in place and had nowhere to expand. The company that sold the fireplace had a recall on it, so they sent us new tempered doors where the glass was NOT glued in place, they were only "trapped" but had some wiggle to them. No more boom.


Try this at your own risk, I can't give you a definitive answer.


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post #6 of 6 (permalink) Old 11-05-2011, 02:10 AM
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I used a heat tape type thing on a 55 for a snake once, never had a problem, used a rheostat to keep the glass 97 degrees, which through the substrate kept the warm side of the tank just right.
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